1 | // Copyright 2019 The Marl Authors. |
2 | // |
3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
4 | // you may not use this file except in compliance with the License. |
5 | // You may obtain a copy of the License at |
6 | // |
7 | // https://www.apache.org/licenses/LICENSE-2.0 |
8 | // |
9 | // Unless required by applicable law or agreed to in writing, software |
10 | // distributed under the License is distributed on an "AS IS" BASIS, |
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
12 | // See the License for the specific language governing permissions and |
13 | // limitations under the License. |
14 | |
15 | #if defined(__x86_64__) |
16 | |
17 | #define MARL_BUILD_ASM 1 |
18 | #include "osfiber_asm_x64.h" |
19 | |
20 | // void marl_fiber_swap(marl_fiber_context* from, const marl_fiber_context* to) |
21 | // rdi: from |
22 | // rsi: to |
23 | .text |
24 | .global MARL_ASM_SYMBOL(marl_fiber_swap) |
25 | .align 4 |
26 | MARL_ASM_SYMBOL(marl_fiber_swap): |
27 | |
28 | // Save context 'from' |
29 | |
30 | // Store callee-preserved registers |
31 | movq %rbx, MARL_REG_RBX(%rdi) |
32 | movq %rbp, MARL_REG_RBP(%rdi) |
33 | movq %r12, MARL_REG_R12(%rdi) |
34 | movq %r13, MARL_REG_R13(%rdi) |
35 | movq %r14, MARL_REG_R14(%rdi) |
36 | movq %r15, MARL_REG_R15(%rdi) |
37 | |
38 | movq (%rsp), %rcx /* call stores the return address on the stack before jumping */ |
39 | movq %rcx, MARL_REG_RIP(%rdi) |
40 | leaq 8(%rsp), %rcx /* skip the pushed return address */ |
41 | movq %rcx, MARL_REG_RSP(%rdi) |
42 | |
43 | // Load context 'to' |
44 | movq %rsi, %r8 |
45 | |
46 | // Load callee-preserved registers |
47 | movq MARL_REG_RBX(%r8), %rbx |
48 | movq MARL_REG_RBP(%r8), %rbp |
49 | movq MARL_REG_R12(%r8), %r12 |
50 | movq MARL_REG_R13(%r8), %r13 |
51 | movq MARL_REG_R14(%r8), %r14 |
52 | movq MARL_REG_R15(%r8), %r15 |
53 | |
54 | // Load first two call parameters |
55 | movq MARL_REG_RDI(%r8), %rdi |
56 | movq MARL_REG_RSI(%r8), %rsi |
57 | |
58 | // Load stack pointer |
59 | movq MARL_REG_RSP(%r8), %rsp |
60 | |
61 | // Load instruction pointer, and jump |
62 | movq MARL_REG_RIP(%r8), %rcx |
63 | jmp *%rcx |
64 | |
65 | #endif // defined(__x86_64__) |
66 | |